About 100 g of the banana peel that contains the dye
component was cut to small pieces and boiled in one liter in a
solution of 0.1% NaOH and concentrated to 500cc. The
slurry was left to react for a period of time wherein a yellow
supernatant forms at the top. This yellow supernatant
changes to amber and then to an opaque black as the reaction
proceeds. The entire slurry was then filtered and any solid
material discarded. The extracted liquor was used as the
foundation of the dye.